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Asp.net Currency Exchange Rate via RSS

Suvendu Banik

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20 Jun 2007

This articles is to explain the use on live XML for displaying data. I have used Exchange Rates from currencysource.com to show one of many use of this technique. I have used bit of comments to explain how this code is working.

Download ExchangeRates.zip - 19.2 KB

Introduction

This code uses an RSS feed offering the latest currency exchange rates and pulls data from it when the user clicks a Fetch button. The user is able to choose a currency for which to fetch exhange rates on. This code is useful since it fetches up-to-date details on currency exchange rates - something which is ever more expected of systems that deal with commercial applications.

Background

This code uses ASP .Net 2.0, C# 2.0 and also demonstrates the usefulness of Prototype.js (a third party Javascript framework).

Using the code

The codebehind code is given as reference and followed by html code

//using System;


//using System.Data;


//using System.Configuration;


//using System.Collections;


//using System.Web;


//using System.Web.Security;


//using System.Web.UI;


//using System.Web.UI.WebControls;


//using System.Web.UI.WebControls.WebParts;


//using System.Web.UI.HtmlControls;


//using System.Xml;


//public partial class Modules_LiveExchangeRates : System.Web.UI.Page


//{


// protected void Page_Load(object sender, EventArgs e)


// {


// if (!Page.IsPostBack)


// {




// }


// }


// private void PopulateGrid(string vstrURL)


// {


// if (lstExchange.Items.Count > 0)


// {


// lstExchange.Items.Clear();


// }


// XmlDocument objDoc = new XmlDocument();


// objDoc.Load(vstrURL);


// XmlNodeList objNL;




// if (null != objDoc)


// {


// objNL = objDoc.SelectNodes("rss/channel/item");


// if (null != objNL)


// {


// foreach (XmlNode XNode in objNL)


// {


// lstExchange.Items.Add(XNode.ChildNodes[0].InnerText);


// } 


// }


// }


// }


// protected void btnFetchValue_Click(object sender, EventArgs e)


// {


// PopulateGrid(txtURL.Text.Trim());


// }


//}


 

 

 

//----------- HTML Code


 //<html xmlns="http://www.w3.org/1999/xhtml" >

//<head id="Head1" runat="server">

//    <title>Page</title>

//    <link href="../Styles/StyleSheet.css" rel="stylesheet" type="text/css" />

//    <script type="text/javascript" src="../scripts/prototype.js"></script>


//    <script type="text/javascript"> 

//    <!--

//function Rvalue() {

//  document.getElementById("rssText").innerHTML = "Copy URL into RSS Application...<br>" + document.frmPage["rss"].value;

//  $("txtURL").value=$("rss").value;

//}

//--> </script> <style type="text/css"> <!--

//.graybox {

//border: solid 1px gray;

//}


//#graybox {

//border: solid 1px gray;

//}


//.rssText {  

//    font-family: Arial, Helvetica, sans-serif; font-size: 0.8em; color: #333399;

//}


//#smlink {

//font-size: .6em;

//color: #dedede;

//font-style: normal;

//font-family: Arial, Helvetica, sans-serif;

//}


//#smlink a:link,#smlink a:visited{

//color: #7e7e7e; /*Was #dedede.*/

//text-decoration: none; }


//#smlink a:hover {

//color: #7e7e7e; 

//text-decoration: underline}

//--> </style>


//</head>

//<body>

//    <form id="frmPage" runat="server">

//    <table id="tblMain" style="width:100%" class="tablebdr1">

//    <tr>

//    <td style="height:20px" class="textorg">Live Exchage Rates</td>


//    </tr>

//    <tr>

//    <td style="height:20px"></td>


//    </tr>


//    <tr>

//    <td>

// <table border="0" cellspacing="2" cellpadding="2" id="graybox" style="width: 273px; height: 74px"> 

// <tr> <td class="textorg"><div align="center">

//    Currency Exchange Rates via <b>RSS</b></div></td></tr><tr><td>

//<select name="rss" onchange="javascript:Rvalue()">

//    <option value="0" selected="selected">Select a Currency...</option>

//    <option value="http://currencysource.com/RSS/ARS.xml">Argentine Peso</option>

//    <option value="http://currencysource.com/RSS/AUD.xml">Australian Dollar</option>

//    <option value="http://currencysource.com/RSS/BHD.xml">Bahrain Dinar</option>

//    <option value="http://currencysource.com/RSS/BWP.xml">Botswana Pula</option>

//    <option value="http://currencysource.com/RSS/BRL.xml">Brazilian Real</option>

//    <option value="http://currencysource.com/RSS/BND.xml">Brunei Dollar</option>

//    <option value="http://currencysource.com/RSS/CAD.xml">Canadian Dollar</option>

//    <option value="http://currencysource.com/RSS/CLP.xml">Chilian Peso</option>

//    <option value="http://currencysource.com/RSS/CNY.xml">Chinese Yuan</option>

//    <option value="http://currencysource.com/RSS/COP.xml">Colombian Peso</option>

//    <option value="http://currencysource.com/RSS/CYP.xml">Cyprus Pound</option>

//    <option value="http://currencysource.com/RSS/CZK.xml">Czech Koruna</option>

//    <option value="http://currencysource.com/RSS/DKK.xml">Danish Krone</option>

//    <option value="http://currencysource.com/RSS/EUR.xml">Euro</option>

//    <option value="http://currencysource.com/RSS/HUF.xml">Hungarian Forint</option>

//    <option value="http://currencysource.com/RSS/ISK.xml">Icelandic Krona</option>

//    <option value="http://currencysource.com/RSS/INR.xml">Indian Rupee</option>

//    <option value="http://currencysource.com/RSS/IDR.xml">Indonesian Rupiah</option>

//    <option value="http://currencysource.com/RSS/IRR.xml">Iranian Rial</option>

//    <option value="http://currencysource.com/RSS/ILS.xml">Israeli New Sheqel</option>

//    <option value="http://currencysource.com/RSS/JPY.xml">Japanese Yen</option>

//    <option value="http://currencysource.com/RSS/KRW.xml">Korean Won</option>

//    <option value="http://currencysource.com/RSS/KWD.xml">Kuwaiti Dinar</option>

//    <option value="http://currencysource.com/RSS/LYD.xml">Libyan Dinar</option>

//    <option value="http://currencysource.com/RSS/MYR.xml">Malaysian Ringgit</option>

//    <option value="http://currencysource.com/RSS/MTL.xml">Maltese Lira</option>

//    <option value="http://currencysource.com/RSS/MUR.xml">Mauritian Rupee</option>

//    <option value="http://currencysource.com/RSS/MXN.xml">Mexican Peso</option>

//    <option value="http://currencysource.com/RSS/NPR.xml">Nepalese Rupee</option>

//    <option value="http://currencysource.com/RSS/NZD.xml">New Zealand Dollar</option>

//    <option value="http://currencysource.com/RSS/NOK.xml">Norwegian Krone</option>

//    <option value="http://currencysource.com/RSS/OMR.xml">Omani Rial</option>

//    <option value="http://currencysource.com/RSS/PKR.xml">Pakistan Rupee</option>

//    <option value="http://currencysource.com/RSS/PLN.xml">Polish Zloty</option>

//    <option value="http://currencysource.com/RSS/GBP.xml">Pound Sterling</option>

//    <option value="http://currencysource.com/RSS/QAR.xml">Qatar Riyal</option>

//    <option value="http://currencysource.com/RSS/SAR.xml">Saudi Arabian Riyal</option>

//    <option value="http://currencysource.com/RSS/SGD.xml">Singapore Dollar</option>

//    <option value="http://currencysource.com/RSS/SIT.xml">Slovenian Tolar</option>

//    <option value="http://currencysource.com/RSS/ZAR.xml">South African Rand</option>

//    <option value="http://currencysource.com/RSS/LKR.xml">Sri Lanka Rupee</option>

//    <option value="http://currencysource.com/RSS/SEK.xml">Swedish Krona</option>

//    <option value="http://currencysource.com/RSS/SEK.xml">Swiss Franc</option>

//    <option value="http://currencysource.com/RSS/THB.xml">Thai Baht</option>

//    <option value="http://currencysource.com/RSS/TTD.xml">Trinidad & Tobago Dollar</option>

//    <option value="http://currencysource.com/RSS/AED.xml">U.A.E. Dirham</option>

//    <option value="http://currencysource.com/RSS/USD.xml">U.S. Dollar</option>

//    <option value="http://currencysource.com/RSS/VEB.xml">Venezuelan Bolivar</option>

//</select>

//</td>

//    </tr>

//     <tr style="display:none">

// <td>

//     <div align="left">

//     </div>

//     <div id="rssText" align="left" class="textorg">


//// URL:

//     </div>

//     <asp:TextBox ID="txtURL" runat="server" Text=""></asp:TextBox>

// </td>

//     </tr>


//  </table>

//  <!-- That's it! Your site visitors now have access to continuously updated Currency Exchange Rates via RSS! --> 

//<asp:Button ID="btnFetchValue" runat="server" Text="Fetch Value" OnClick="btnFetchValue_Click" /></td>

//    </tr>


//     <tr>

//    <td>

//    <asp:ListBox ID="lstExchange" runat="server" Width="363px" Height="456px"></asp:ListBox>

//    </td>



//    </tr>



//    </table>

//    </form>

//</body>

//</html>

Remember to set the Language of your code snippet using the Language dropdown.

Use the "var" button to to wrap Variable or class names in <code> tags like this.

License

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